CITY OF MATHIS water quality, TX

At a glance

3 above the safety limit, 2 detections to watch

Active violation

Lead and Copper Rule Revisions

EPA records an open, unresolved violation against this system for Lead and Copper Rule Revisions.

EPA status: Unaddressed · See details below
Active violation

Lead and Copper Rule Revisions

EPA records an open, unresolved violation against this system for Lead and Copper Rule Revisions.

EPA status: Unaddressed · See details below
Active violation

Lead and Copper Rule Revisions

EPA records an open, unresolved violation against this system for Lead and Copper Rule Revisions.

EPA status: Unaddressed · See details below
Detected (no safe amount)

Lead

0.00114 mg/L

Public health experts agree no amount of lead in drinking water is safe. Even low levels can affect children's brain development.

Most recent lead and copper test · See details below
Detected — worth watching

lithium

0.0238 mg/L

lithium was found at a level below the federal limit, but high enough to keep an eye on.

Most recent EPA PFAS test · See details below
Not fluoridated

Fluoride

Not added

CDC's My Water's Fluoride listing does not report this system as fluoridating its drinking water.

Per CDC My Water's Fluoride · See details below

Past 5 years: 49 health-based violations on file, all marked Resolved or Archived. See compliance history below.

Risk classification follows EPA's published values for safe drinking water, with caution and concern bands reviewed by a clinician. Past resolved violations do not influence this card. See methodology.

Lead service line inventory

No inventory data on file

We do not yet have this utility's published Lead Service Line Inventory on file. The EPA Lead and Copper Rule Improvements (LCRI) required every community water system to publish one by October 16, 2024 and to identify and replace any lead lines within 10 years. How lead enters drinking water.

Phase 1 coverage focuses on the largest NC utilities. Smaller systems will be added; in the meantime, ask your utility for their inventory or check their Consumer Confidence Report.

Lead and copper test results

The most recent measurement per contaminant from EPA's Lead and Copper Rule sampling.

Why only lead and copper, and not arsenic, nitrate, or others?

EPA's bulk SDWIS download is the only nationwide per-system sample data they publish, and it only includes the Lead and Copper Rule table. Values for other regulated contaminants (TTHMs, nitrate, arsenic, etc.) appear on this page only when they trigger a violation. For the full per-system contaminant suite, see the utility's annual Consumer Confidence Report (link further down the page).

Most recent measurements per contaminant (Lead and Copper Rule) . Sorted by risk: concern first, then caution, then unrated, then safe.
Contaminant	Most recent	Date	Risk
Lead PB90	0.00114 mg/L	December 31, 2024	Caution Lead has no safe level (MCLG=0). LCR action level is 0.015 mg/L for the 90th-percentile sample; the LCRI (Oct 2024) lowers the action level to 0.010 mg/L effective Nov 2027. Caution at any detection above LOD; concern anchored to the future LCRI value (0.010 mg/L) for forward consistency. Learn more about Lead. Source.

Data from EPA SDWIS (Lead and Copper Rule sample table) , last refreshed May 24, 2026.

PFAS and emerging contaminants

This system was tested 120 times under EPA's latest PFAS monitoring program; 3 of the 30 chemicals tested were detected.

What is this testing program?

EPA's fifth Unregulated Contaminant Monitoring Rule cycle (UCMR 5, 2023 to 2025) required every public water system serving over 3,300 people to test for 29 per- and polyfluoroalkyl substances (PFAS) plus lithium; 30 chemicals in total. Most recent detection per chemical shown below.

Most recent UCMR 5 detection per contaminant . Sorted by risk: concern first, then caution, then unrated, then safe.
Contaminant	Most recent detection	Date	Risk
lithium	0.0238 mg/L	November 8, 2023	Caution HAL only; not enforceable. UCMR-monitored. Learn more about lithium. Source.
6:2 FTS	12.1 ng/L	November 8, 2023	No federal limit EPA has not set a federal drinking-water limit for this contaminant. It is among the substances EPA is studying under the Unregulated Contaminant Monitoring Rule (UCMR). See the guide for what the science currently says. Learn more about 6:2 FTS.
PFBA	7.2 ng/L	November 8, 2023	No federal limit EPA has not set a federal drinking-water limit for this contaminant. It is among the substances EPA is studying under the Unregulated Contaminant Monitoring Rule (UCMR). See the guide for what the science currently says. Learn more about PFBA.

Tested but not detected (27 contaminants)

EPA tested for these substances and every sample was below the minimum reporting level. Absence of detection does not mean true zero; it means below the laboratory's quantitation threshold.

Data from EPA UCMR 5 (Unregulated Contaminant Monitoring Rule) , last refreshed May 24, 2026.

Fluoride

Per CDC My Water's Fluoride

CITY OF MATHIS does not add fluoride to its drinking water.

This system has not reported adding fluoride to its water on CDC's My Water's Fluoride listing. Natural fluoride may still be present at trace levels from the source water; the utility's annual water quality report has the latest measured concentration.

Source: CDC My Water's Fluoride, listed under MATHIS CITY OF (San Patricio County). Verify on CDC's site .

Area context

San Patricio County, TX (2020 data)

Community water systems: 16 of 18 add fluoride
Population on fluoridated water: 62,831 of 67,780 (92.7%)

Texas statewide (2020 data)

Population on fluoridated water: 19,743,163 of 27,818,869 (71.0%)
Community water systems adding fluoride: 2,573 of 6,046

Data from CDC My Water's Fluoride (per-system status) , last refreshed May 19, 2026.

Data from CDC Water Fluoridation Reporting System (state and county aggregates) , last refreshed May 16, 2026.

Recorded contaminant measurements (from violations)

When this system exceeded a regulatory limit and EPA recorded the measured value, that value is shown here. These are not routine sample results: they are the values the violation was triggered on.

Measured values from recorded violations . Most recent first.
Period	Contaminant	Measured	Federal MCL	Status
July 1, 2025	Tthm	0.09MG/L	0.08 MG/L	Health-based
July 1, 2025	Tthm	0.09MG/L	0.08 MG/L	Health-based
July 1, 2025	Tthm	0.09MG/L	0.08 MG/L	Health-based
April 1, 2025	Tthm	0.086MG/L	0.08 MG/L	Health-based
April 1, 2025	Tthm	0.086MG/L	0.08 MG/L	Health-based
April 1, 2025	Tthm	0.086MG/L	0.08 MG/L	Health-based
April 1, 2025	Tthm	0.086MG/L	0.08 MG/L	Health-based
July 1, 2023	Tthm	0.093MG/L	0.08 MG/L	Health-based
July 1, 2023	Tthm	0.093MG/L	0.08 MG/L	Health-based
July 1, 2023	Tthm	0.093MG/L	0.08 MG/L	Health-based
July 1, 2023	Tthm	0.093MG/L	0.08 MG/L	Health-based
April 1, 2023	Tthm	0.117MG/L	0.08 MG/L	Health-based
April 1, 2023	Tthm	0.117MG/L	0.08 MG/L	Health-based
April 1, 2023	Tthm	0.117MG/L	0.08 MG/L	Health-based
April 1, 2023	Tthm	0.117MG/L	0.08 MG/L	Health-based
January 1, 2023	Tthm	0.115MG/L	0.08 MG/L	Health-based
January 1, 2023	Tthm	0.115MG/L	0.08 MG/L	Health-based
January 1, 2023	Tthm	0.115MG/L	0.08 MG/L	Health-based
January 1, 2023	Tthm	0.115MG/L	0.08 MG/L	Health-based
October 1, 2022	Tthm	0.105MG/L	0.08 MG/L	Health-based
October 1, 2022	Tthm	0.105MG/L	0.08 MG/L	Health-based
October 1, 2022	Tthm	0.105MG/L	0.08 MG/L	Health-based
October 1, 2022	Tthm	0.105MG/L	0.08 MG/L	Health-based
July 1, 2022	Tthm	0.093MG/L	0.08 MG/L	Health-based
July 1, 2022	Tthm	0.093MG/L	0.08 MG/L	Health-based
July 1, 2022	Tthm	0.093MG/L	0.08 MG/L	Health-based
July 1, 2022	Tthm	0.093MG/L	0.08 MG/L	Health-based
April 1, 2022	Tthm	0.084MG/L	0.08 MG/L	Health-based
April 1, 2022	Tthm	0.084MG/L	0.08 MG/L	Health-based
April 1, 2022	Tthm	0.084MG/L	0.08 MG/L	Health-based
April 1, 2022	Tthm	0.084MG/L	0.08 MG/L	Health-based
January 1, 2022	Tthm	0.086MG/L	0.08 MG/L	Health-based
January 1, 2022	Tthm	0.086MG/L	0.08 MG/L	Health-based
January 1, 2022	Tthm	0.086MG/L	0.08 MG/L	Health-based
January 1, 2022	Tthm	0.086MG/L	0.08 MG/L	Health-based
January 1, 2022	Tthm	0.086MG/L	0.08 MG/L	Health-based
January 1, 2022	Tthm	0.086MG/L	0.08 MG/L	Health-based
October 1, 2021	Tthm	0.081MG/L	0.08 MG/L	Health-based
October 1, 2021	Tthm	0.081MG/L	0.08 MG/L	Health-based
October 1, 2021	Tthm	0.081MG/L	0.08 MG/L	Health-based
October 1, 2021	Tthm	0.081MG/L	0.08 MG/L	Health-based
October 1, 2021	Tthm	0.081MG/L	0.08 MG/L	Health-based
October 1, 2021	Tthm	0.081MG/L	0.08 MG/L	Health-based
July 1, 2021	Tthm	0.082MG/L	0.08 MG/L	Health-based
July 1, 2021	Tthm	0.082MG/L	0.08 MG/L	Health-based
July 1, 2021	Tthm	0.082MG/L	0.08 MG/L	Health-based
July 1, 2021	Tthm	0.082MG/L	0.08 MG/L	Health-based
July 1, 2021	Tthm	0.082MG/L	0.08 MG/L	Health-based
July 1, 2021	Tthm	0.082MG/L	0.08 MG/L	Health-based

Data from EPA SDWIS (violation records) , last refreshed May 24, 2026.

Compliance history

EPA-recorded violations against this system over the last 5 years.

How to read this section

Health-based violations are when a measured limit was exceeded; the measured concentration is shown alongside the EPA federal limit where SDWIS published it. Monitoring and reporting items are paperwork issues (missed sample dates, late filings) that do not themselves indicate unsafe water.

3 active health-based violations

EPA records 3 health-based violations that have not yet been resolved. An additional 49 health-based violations in the last 5 years are already resolved.

Health-based violations in the last 5 years
Period start	Contaminant	What happened	Measured level	Status
July 1, 2025	Tthm	Maximum Contaminant Level Violation, Average	0.090 MG/L MCL 0.080 MG/L	Resolved
July 1, 2025	Tthm	Maximum Contaminant Level Violation, Average	0.090 MG/L MCL 0.080 MG/L	Resolved
July 1, 2025	Tthm	Maximum Contaminant Level Violation, Average	0.090 MG/L MCL 0.080 MG/L	Resolved
April 1, 2025	Tthm	Maximum Contaminant Level Violation, Average	0.086 MG/L MCL 0.080 MG/L	Resolved
April 1, 2025	Tthm	Maximum Contaminant Level Violation, Average	0.086 MG/L MCL 0.080 MG/L	Resolved
April 1, 2025	Tthm	Maximum Contaminant Level Violation, Average	0.086 MG/L MCL 0.080 MG/L	Resolved
April 1, 2025	Tthm	Maximum Contaminant Level Violation, Average	0.086 MG/L MCL 0.080 MG/L	Resolved
October 17, 2024	Lead and Copper Rule Revisions	LSL Inventory	Not reported	Unaddressed
October 17, 2024	Lead and Copper Rule Revisions	LSL Inventory	Not reported	Unaddressed
October 17, 2024	Lead and Copper Rule Revisions	LSL Inventory	Not reported	Unaddressed
July 1, 2023	Tthm	Maximum Contaminant Level Violation, Average	0.093 MG/L MCL 0.080 MG/L	Resolved
July 1, 2023	Tthm	Maximum Contaminant Level Violation, Average	0.093 MG/L MCL 0.080 MG/L	Resolved
July 1, 2023	Tthm	Maximum Contaminant Level Violation, Average	0.093 MG/L MCL 0.080 MG/L	Resolved
July 1, 2023	Tthm	Maximum Contaminant Level Violation, Average	0.093 MG/L MCL 0.080 MG/L	Resolved
April 1, 2023	Tthm	Maximum Contaminant Level Violation, Average	0.117 MG/L MCL 0.080 MG/L	Resolved
April 1, 2023	Tthm	Maximum Contaminant Level Violation, Average	0.117 MG/L MCL 0.080 MG/L	Resolved
April 1, 2023	Tthm	Maximum Contaminant Level Violation, Average	0.117 MG/L MCL 0.080 MG/L	Resolved
April 1, 2023	Tthm	Maximum Contaminant Level Violation, Average	0.117 MG/L MCL 0.080 MG/L	Resolved
January 1, 2023	Tthm	Maximum Contaminant Level Violation, Average	0.115 MG/L MCL 0.080 MG/L	Resolved
January 1, 2023	Tthm	Maximum Contaminant Level Violation, Average	0.115 MG/L MCL 0.080 MG/L	Resolved
January 1, 2023	Tthm	Maximum Contaminant Level Violation, Average	0.115 MG/L MCL 0.080 MG/L	Resolved
January 1, 2023	Tthm	Maximum Contaminant Level Violation, Average	0.115 MG/L MCL 0.080 MG/L	Resolved
October 1, 2022	Tthm	Maximum Contaminant Level Violation, Average	0.105 MG/L MCL 0.080 MG/L	Resolved
October 1, 2022	Tthm	Maximum Contaminant Level Violation, Average	0.105 MG/L MCL 0.080 MG/L	Resolved
October 1, 2022	Tthm	Maximum Contaminant Level Violation, Average	0.105 MG/L MCL 0.080 MG/L	Resolved
October 1, 2022	Tthm	Maximum Contaminant Level Violation, Average	0.105 MG/L MCL 0.080 MG/L	Resolved
July 1, 2022	Tthm	Maximum Contaminant Level Violation, Average	0.093 MG/L MCL 0.080 MG/L	Resolved
July 1, 2022	Tthm	Maximum Contaminant Level Violation, Average	0.093 MG/L MCL 0.080 MG/L	Resolved
July 1, 2022	Tthm	Maximum Contaminant Level Violation, Average	0.093 MG/L MCL 0.080 MG/L	Resolved
July 1, 2022	Tthm	Maximum Contaminant Level Violation, Average	0.093 MG/L MCL 0.080 MG/L	Resolved
April 1, 2022	Tthm	Maximum Contaminant Level Violation, Average	0.084 MG/L MCL 0.080 MG/L	Resolved
April 1, 2022	Tthm	Maximum Contaminant Level Violation, Average	0.084 MG/L MCL 0.080 MG/L	Resolved
April 1, 2022	Tthm	Maximum Contaminant Level Violation, Average	0.084 MG/L MCL 0.080 MG/L	Resolved
April 1, 2022	Tthm	Maximum Contaminant Level Violation, Average	0.084 MG/L MCL 0.080 MG/L	Resolved
January 1, 2022	Tthm	Maximum Contaminant Level Violation, Average	0.086 MG/L MCL 0.080 MG/L	Resolved
January 1, 2022	Tthm	Maximum Contaminant Level Violation, Average	0.086 MG/L MCL 0.080 MG/L	Resolved
January 1, 2022	Tthm	Maximum Contaminant Level Violation, Average	0.086 MG/L MCL 0.080 MG/L	Resolved
January 1, 2022	Tthm	Maximum Contaminant Level Violation, Average	0.086 MG/L MCL 0.080 MG/L	Resolved
January 1, 2022	Tthm	Maximum Contaminant Level Violation, Average	0.086 MG/L MCL 0.080 MG/L	Resolved
January 1, 2022	Tthm	Maximum Contaminant Level Violation, Average	0.086 MG/L MCL 0.080 MG/L	Resolved
October 1, 2021	Tthm	Maximum Contaminant Level Violation, Average	0.081 MG/L MCL 0.080 MG/L	Resolved
October 1, 2021	Tthm	Maximum Contaminant Level Violation, Average	0.081 MG/L MCL 0.080 MG/L	Resolved
October 1, 2021	Tthm	Maximum Contaminant Level Violation, Average	0.081 MG/L MCL 0.080 MG/L	Resolved
October 1, 2021	Tthm	Maximum Contaminant Level Violation, Average	0.081 MG/L MCL 0.080 MG/L	Resolved
October 1, 2021	Tthm	Maximum Contaminant Level Violation, Average	0.081 MG/L MCL 0.080 MG/L	Resolved
October 1, 2021	Tthm	Maximum Contaminant Level Violation, Average	0.081 MG/L MCL 0.080 MG/L	Resolved
July 1, 2021	Tthm	Maximum Contaminant Level Violation, Average	0.082 MG/L MCL 0.080 MG/L	Resolved
July 1, 2021	Tthm	Maximum Contaminant Level Violation, Average	0.082 MG/L MCL 0.080 MG/L	Resolved
July 1, 2021	Tthm	Maximum Contaminant Level Violation, Average	0.082 MG/L MCL 0.080 MG/L	Resolved
July 1, 2021	Tthm	Maximum Contaminant Level Violation, Average	0.082 MG/L MCL 0.080 MG/L	Resolved
July 1, 2021	Tthm	Maximum Contaminant Level Violation, Average	0.082 MG/L MCL 0.080 MG/L	Resolved
July 1, 2021	Tthm	Maximum Contaminant Level Violation, Average	0.082 MG/L MCL 0.080 MG/L	Resolved

34 monitoring and reporting item s (paperwork) , 6 still open · these are not health risks

Monitoring and reporting items in the last 5 years
Period start	Relates to	Item	Status
July 26, 2025	Public Notice	Public Notification Violation for NPDWR Violation	Resolved
July 26, 2025	Public Notice	Public Notification Violation for NPDWR Violation	Resolved
July 1, 2025	Consumer Confidence Rule	Consumer Confidence Report Inadequate Reporting	Unaddressed
May 1, 2025	Public Notice	Public Notification Violation for NPDWR Violation	Unaddressed
May 1, 2025	Public Notice	Public Notification Violation for NPDWR Violation	Unaddressed
December 30, 2024	Lead and Copper Rule	Lead Consumer Notice	Resolved
December 30, 2024	Lead and Copper Rule	Lead Consumer Notice	Resolved
October 17, 2024	Lead and Copper Rule Revisions	LSL Reporting	Unaddressed
October 17, 2024	Lead and Copper Rule Revisions	LSL Reporting	Unaddressed
October 17, 2024	Lead and Copper Rule Revisions	LSL Reporting	Unaddressed
July 2, 2024	Consumer Confidence Rule	Consumer Confidence Report Inadequate Reporting	Resolved
July 2, 2024	Consumer Confidence Rule	Consumer Confidence Report Inadequate Reporting	Resolved
March 31, 2024	Lead and Copper Rule	Lead Consumer Notice	Resolved
March 31, 2024	Lead and Copper Rule	Lead Consumer Notice	Resolved
March 31, 2024	Lead and Copper Rule	Lead Consumer Notice	Resolved
December 31, 2023	Public Notice	Public Notification Violation for NPDWR Violation	Resolved
December 31, 2023	Public Notice	Public Notification Violation for NPDWR Violation	Resolved
December 21, 2023	Public Notice	Public Notification Violation for NPDWR Violation	Resolved
December 21, 2023	Public Notice	Public Notification Violation for NPDWR Violation	Resolved
October 6, 2023	Tthm	Failure Submit IDSE/Subpart V Plan Rpt	Resolved
October 6, 2023	Tthm	Failure Submit IDSE/Subpart V Plan Rpt	Resolved
October 6, 2023	Tthm	Failure Submit IDSE/Subpart V Plan Rpt	Resolved
October 6, 2023	Tthm	Failure Submit IDSE/Subpart V Plan Rpt	Resolved
July 1, 2023	Interim Enhanced Surface Water Treatment Rule	Monitoring, Turbidity (Enhanced SWTR)	Resolved
July 1, 2023	Interim Enhanced Surface Water Treatment Rule	Monitoring, Turbidity (Enhanced SWTR)	Resolved
July 1, 2023	Interim Enhanced Surface Water Treatment Rule	Monitoring, Turbidity (Enhanced SWTR)	Resolved
July 1, 2023	Interim Enhanced Surface Water Treatment Rule	Monitoring, Turbidity (Enhanced SWTR)	Resolved
March 23, 2023	Public Notice	Public Notification Violation for NPDWR Violation	Resolved
January 19, 2023	Public Notice	Public Notification Violation for NPDWR Violation	Resolved
January 19, 2023	Public Notice	Public Notification Violation for NPDWR Violation	Resolved
October 1, 2022	Lead and Copper Rule	Follow-up Or Routine LCR Tap M/R	Resolved
October 1, 2022	Lead and Copper Rule	Follow-up Or Routine LCR Tap M/R	Resolved
October 1, 2022	Lead and Copper Rule	Follow-up Or Routine LCR Tap M/R	Resolved
October 1, 2022	Lead and Copper Rule	Follow-up Or Routine LCR Tap M/R	Resolved

56 older violation s (5-10 years ago) · 54 health-based, 2 paperwork , all resolved

Violations 5-10 years ago (56 total)
Period start	Relates to	Item	Measured level	Status
October 1, 2018	Tthm	Maximum Contaminant Level Violation, Average	0.089 MG/L MCL 0.080 MG/L	Resolved
October 1, 2018	Tthm	Maximum Contaminant Level Violation, Average	0.089 MG/L MCL 0.080 MG/L	Resolved
October 1, 2018	Tthm	Maximum Contaminant Level Violation, Average	0.089 MG/L MCL 0.080 MG/L	Resolved
July 1, 2018	Tthm	Maximum Contaminant Level Violation, Average	0.102 MG/L MCL 0.080 MG/L	Resolved
July 1, 2018	Tthm	Maximum Contaminant Level Violation, Average	0.102 MG/L MCL 0.080 MG/L	Resolved
July 1, 2018	Tthm	Maximum Contaminant Level Violation, Average	0.102 MG/L MCL 0.080 MG/L	Resolved
July 1, 2018	Tthm	Maximum Contaminant Level Violation, Average	0.102 MG/L MCL 0.080 MG/L	Resolved
April 1, 2018	Tthm	Maximum Contaminant Level Violation, Average	0.105 MG/L MCL 0.080 MG/L	Resolved
April 1, 2018	Tthm	Maximum Contaminant Level Violation, Average	0.105 MG/L MCL 0.080 MG/L	Resolved
April 1, 2018	Tthm	Maximum Contaminant Level Violation, Average	0.105 MG/L MCL 0.080 MG/L	Resolved
April 1, 2018	Tthm	Maximum Contaminant Level Violation, Average	0.105 MG/L MCL 0.080 MG/L	Resolved
April 1, 2018	Tthm	Maximum Contaminant Level Violation, Average	0.105 MG/L MCL 0.080 MG/L	Resolved
March 14, 2018	Public Notice	Public Notification Violation for NPDWR Violation	—	Resolved
March 14, 2018	Public Notice	Public Notification Violation for NPDWR Violation	—	Resolved
January 1, 2018	Tthm	Maximum Contaminant Level Violation, Average	0.115 MG/L MCL 0.080 MG/L	Resolved
January 1, 2018	Tthm	Maximum Contaminant Level Violation, Average	0.115 MG/L MCL 0.080 MG/L	Resolved
January 1, 2018	Tthm	Maximum Contaminant Level Violation, Average	0.115 MG/L MCL 0.080 MG/L	Resolved
January 1, 2018	Tthm	Maximum Contaminant Level Violation, Average	0.115 MG/L MCL 0.080 MG/L	Resolved
January 1, 2018	Total Haloacetic Acids (Haa5)	Maximum Contaminant Level Violation, Average	0.063 MG/L MCL 0.060 MG/L	Resolved
January 1, 2018	Total Haloacetic Acids (Haa5)	Maximum Contaminant Level Violation, Average	0.063 MG/L MCL 0.060 MG/L	Resolved
January 1, 2018	Total Haloacetic Acids (Haa5)	Maximum Contaminant Level Violation, Average	0.063 MG/L MCL 0.060 MG/L	Resolved
October 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.110 MG/L MCL 0.080 MG/L	Resolved
October 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.110 MG/L MCL 0.080 MG/L	Resolved
October 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.110 MG/L MCL 0.080 MG/L	Resolved
October 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.110 MG/L MCL 0.080 MG/L	Resolved
October 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.110 MG/L MCL 0.080 MG/L	Resolved
July 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.107 MG/L MCL 0.080 MG/L	Resolved
July 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.107 MG/L MCL 0.080 MG/L	Resolved
July 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.107 MG/L MCL 0.080 MG/L	Resolved
July 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.107 MG/L MCL 0.080 MG/L	Resolved
July 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.107 MG/L MCL 0.080 MG/L	Resolved
July 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.107 MG/L MCL 0.080 MG/L	Resolved
July 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.107 MG/L MCL 0.080 MG/L	Resolved
July 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.107 MG/L MCL 0.080 MG/L	Resolved
July 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.107 MG/L MCL 0.080 MG/L	Resolved
July 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.107 MG/L MCL 0.080 MG/L	Resolved
July 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.107 MG/L MCL 0.080 MG/L	Resolved
July 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.107 MG/L MCL 0.080 MG/L	Resolved
April 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.097 MG/L MCL 0.080 MG/L	Resolved
April 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.097 MG/L MCL 0.080 MG/L	Resolved
April 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.097 MG/L MCL 0.080 MG/L	Resolved
April 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.097 MG/L MCL 0.080 MG/L	Resolved
April 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.097 MG/L MCL 0.080 MG/L	Resolved
April 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.097 MG/L MCL 0.080 MG/L	Resolved
January 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.081 MG/L MCL 0.080 MG/L	Resolved
January 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.081 MG/L MCL 0.080 MG/L	Resolved
January 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.081 MG/L MCL 0.080 MG/L	Resolved
January 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.081 MG/L MCL 0.080 MG/L	Resolved
January 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.081 MG/L MCL 0.080 MG/L	Resolved
January 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.081 MG/L MCL 0.080 MG/L	Resolved
January 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.087 MG/L MCL 0.080 MG/L	Resolved
January 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.087 MG/L MCL 0.080 MG/L	Resolved
January 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.087 MG/L MCL 0.080 MG/L	Resolved
January 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.087 MG/L MCL 0.080 MG/L	Resolved
January 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.087 MG/L MCL 0.080 MG/L	Resolved
January 1, 2017	Tthm	Maximum Contaminant Level Violation, Average	0.087 MG/L MCL 0.080 MG/L	Resolved

Data from EPA SDWIS (violation records) , last refreshed May 24, 2026.

Where to see every contaminant this utility tested for

EPA's bulk SDWIS dataset gives MyTapWater.us per-system measured values for lead and copper, plus violation records for everything else. To see every regulated contaminant this utility tested for in the past year (TTHMs, HAA5, nitrate, arsenic, fluoride, chromium, etc.) with measured values, read the utility's Consumer Confidence Report (CCR).

Every community water system is required by EPA to publish a CCR annually, by July 1, listing every contaminant they sampled, the measured value, the federal limit, and any health-based exceedances. Most utilities post the report online; some mail it with your bill.

How to find CITY OF MATHIS's CCR:

Search the web for "CITY OF MATHIS consumer confidence report" . The PDF is usually on the utility's own website.
Or call the utility directly. Their phone number is in the contact section below.

Compare nearby utilities by population served.

CITY OF PORTLAND
23k served · San Patricio County
CITY OF INGLESIDE
10k served · San Patricio County
CITY OF ARANSAS PASS
8,088 served · San Patricio County
CITY OF SINTON
5,505 served · San Patricio County
RINCON WSC
5,034 served · San Patricio County

Contact this utility

Public administrative contact information for this water system, as filed with the EPA. Use this to ask about your service line, request your home's lead status, or report a water quality issue.

Administrator: VILLAREAL, CIRI
Phone: 361-547-3343
Mailing address: 411 E SAN PATRICIO AVE
MATHIS, TX 78368-2351

Where this page's data comes from

Bundle released 2026-Q2, regenerated May 24, 2026. Each section above also shows its own source date so you can tell at a glance how fresh that part of the page is.

EPA SDWIS bulk download — last refreshed May 24, 2026 (system info, violations, lead and copper samples).
EPA UCMR 5 (Unregulated Contaminant Monitoring Rule) — last refreshed May 24, 2026 (PFAS and lithium).
CDC My Water's Fluoride — last refreshed May 19, 2026 (per-system Yes/No fluoridation status).
CDC Water Fluoridation Reporting System — last refreshed May 16, 2026 (state and county fluoridation aggregates).

Every value on this page is cross-verified before publication; read our methodology for the verification steps and corrections process.